CN-121985695-A - Display panel and display device

Abstract

The invention discloses a display panel and a display device, wherein the display panel comprises a substrate, a light-emitting functional layer arranged on one side of the substrate, wherein the light-emitting functional layer comprises a plurality of light-emitting units, a light extraction layer arranged on one side of the light-emitting units, which is away from the substrate, along the direction perpendicular to the surface of the substrate, the light extraction layer comprises at least two first-type refractive layers and at least one second-type refractive layer, the first-type refractive layers and the second-type refractive layers are alternately laminated in the direction of the substrate pointing to the light-emitting functional layer, the refractive index of each first-type refractive layer is smaller than that of the second-type refractive layer, or the refractive index of each first-type refractive layer is larger than that of the second-type refractive layer, and the thickness of at least one first-type refractive layer and the thickness of at least one second-type refractive layer are different. The spectrum narrowing is realized, the color point range is enlarged, the color gamut is improved, the brightness attenuation specification is met, the display effect of the display panel is improved, and the service performance of the display panel is improved.

Inventors

• XIE MEIHUA
• WU CHEN

Assignees

• 武汉天马微电子有限公司

Dates

Publication Date

20260505

Application Date

20260210

Claims (20)

1. 1. A display panel, comprising: A substrate; the light-emitting functional layer is arranged on one side of the substrate and comprises a plurality of light-emitting units; The light extraction layer is arranged on one side of the light emitting unit, away from the substrate, along the direction perpendicular to the surface of the substrate, and comprises at least two first-type refraction layers and at least one second-type refraction layer, the substrate points to the direction of the light emitting functional layer, and the first-type refraction layers and the second-type refraction layers are alternately stacked; the refractive index of each first type of refractive layer is smaller than that of the second type of refractive layer, or the refractive index of each first type of refractive layer is larger than that of the second type of refractive layer, and the thickness of at least one layer of the first type of refractive layer is different from the thickness of at least one layer of the second type of refractive layer.
2. 2. The display panel of claim 1, wherein the refractive index of the first type of refractive layer is less than the refractive index of the second type of refractive layer; The refractive index of the first type of refractive layer is greater than or equal to 1.3 and less than or equal to 1.6, and the refractive index of the second type of refractive layer is greater than or equal to 1.8 and less than or equal to 3.
3. 3. The display panel of claim 2, wherein the material of the first type of refractive layer comprises a metal organic complex material; The material of the second type refraction layer comprises polycyclic aromatic hydrocarbon derivative organic material.
4. 4. The display panel according to claim 2, wherein the light extraction layer includes two refractive layers of the first type and one refractive layer of the second type; one of the two first-type refraction layers is a first sub-refraction layer, the other is a second sub-refraction layer, and the other is a third sub-refraction layer; the substrate points to the direction of the luminous functional layer, and the first sub-refraction layer, the third sub-refraction layer and the second sub-refraction layer are sequentially stacked; The absolute value of the difference between the thickness of the first sub-refractive layer and the thickness of the second sub-refractive layer is less than or equal to 10% of the thickness of the second sub-refractive layer along the direction perpendicular to the surface of the substrate.
5. 5. The display panel according to claim 4, wherein the first sub-refractive layer and the second sub-refractive layer have a thickness of 550 a/m or more and 650 a/m or less in a direction perpendicular to a plane of the substrate, and/or, The third sub-refractive layer has a thickness of 300 a/m or more and 400 a/m or less.
6. 6. The display panel of claim 4, wherein the first sub-refractive layer and the second sub-refractive layer are the same material.
7. 7. The display panel of claim 1, wherein the light extraction layer comprises at least two refractive layers of the first type and at least two refractive layers of the second type.
8. 8. The display panel according to claim 7, wherein the light extraction layer includes two layers of the first type of refractive layer and two layers of the second type of refractive layer; one of the two first-type refraction layers is a first sub-refraction layer, the other is a second sub-refraction layer, one of the two second-type refraction layers is a third sub-refraction layer, and the other is a fourth sub-refraction layer; the substrate points to the direction of the light-emitting functional layer, and the first sub-refraction layer, the third sub-refraction layer, the second sub-refraction layer and the fourth sub-refraction layer are sequentially stacked.
9. 9. The display panel according to claim 8, wherein the thicknesses of the first sub-refractive layer, the third sub-refractive layer, the second sub-refractive layer, and the fourth sub-refractive layer are sequentially increased in a direction of the light emitting function layer by the substrate.
10. 10. The display panel according to claim 8, wherein a thickness of the first sub-refractive layer is 450 a/m or more and 550 a/m or less in a direction perpendicular to a surface of the substrate; the thickness of the second sub-refraction layer is greater than or equal to 650 and less than 750; The thickness of the third sub-refraction layer is more than or equal to 550 and less than 650; the fourth sub-refractive layer has a thickness of 750 to 850 angstroms.
11. 11. The display panel of claim 8, wherein the first and second sub-refractive layers are the same material and the third and fourth sub-refractive layers are the same material.
12. 12. The display panel according to claim 7, wherein the light extraction layer includes three layers of the first type of refractive layer and two layers of the second type of refractive layer; the three layers of the first type of refraction layers comprise a first sub-refraction layer, a second sub-refraction layer and a fifth sub-refraction layer, one of the two layers of the second type of refraction layers is a third sub-refraction layer, and the other layer of the second type of refraction layer is a fourth sub-refraction layer; The substrate points to the direction of the light-emitting functional layer, and the first sub-refraction layer, the third sub-refraction layer, the second sub-refraction layer, the fourth sub-refraction layer and the fifth sub-refraction layer are sequentially stacked.
13. 13. The display panel according to claim 12, wherein a thickness of the first sub-refractive layer is 650 a/m or more and 750 a/m or less in a direction perpendicular to a plane of the substrate; the thickness of the second sub-refraction layer is greater than or equal to 750 and less than or equal to 850; the thickness of the third sub-refraction layer is greater than or equal to 550 and less than or equal to 650; The thickness of the fourth sub-refractive layer is greater than or equal to 450 and less than 550; the fifth sub-refractive layer has a thickness of 450 to 550 angstroms.
14. 14. The display panel according to claim 12, wherein an absolute value of a difference between a thickness of the fourth sub-refractive layer and a thickness of the fifth sub-refractive layer in a direction perpendicular to a plane of the substrate is less than or equal to 10% of the thickness of the fifth sub-refractive layer.
15. 15. The display panel of claim 12, wherein the first, second, and fifth sub-refractive layers are the same material, and the third and fourth sub-refractive layers are the same material.
16. 16. The display panel according to claim 1, wherein the light emitting unit includes a first light emitting unit and a second light emitting unit which emit light of different colors; The absolute value of the difference between the thickness of the light extraction layer corresponding to the region where the first light emitting unit is located and the thickness of the light extraction layer corresponding to the region where the second light emitting unit is located is less than or equal to 10% of the thickness of the light extraction layer corresponding to the region where the second light emitting unit is located.
17. 17. The display panel according to claim 1, further comprising a second electrode layer provided between the light emitting unit and the light extraction layer and a first electrode layer provided on a side of the light emitting unit toward the substrate.
18. 18. The display panel according to claim 17, wherein the light-emitting unit includes a first stacked light-emitting unit and a second stacked light-emitting unit which are sequentially disposed in a direction away from the substrate, and a charge generation layer is provided between the first stacked light-emitting unit and the second stacked light-emitting unit.
19. 19. The display panel according to claim 1, wherein a reflectance of the light extraction layer is 50% or more.
20. 20. The display panel according to claim 1, further comprising a light shielding layer and a color blocking structure provided on a side of the light extraction layer facing away from the substrate; The light shielding layer comprises a light shielding structure and a plurality of light shielding layer openings which are arranged at intervals through the light shielding structure, the color resistance structure at least partially overlaps the light emitting unit in the direction perpendicular to the plane of the substrate, and the color resistance structure at least partially overlaps the light shielding layer openings.

Description

Display panel and display device Technical Field The invention belongs to the technical field of electronic products, and particularly relates to a display panel and a display device. Background Along with the progress of technology, digital display panels such as smart phones and tablet computers are widely used, wherein a display screen is an indispensable interpersonal communication interface in the display panels. The display panel has the advantages of self-luminescence, energy conservation, consumption reduction, flexibility, good flexibility and the like, does not need a backlight source, has the characteristics of high reaction speed and good display effect, is focused by users, and is widely applied to terminal products such as smart phones, tablet computers and the like. However, the use performance of the display panel cannot meet the requirements due to the limitation of the structural materials of the existing display panel. Therefore, a new display panel and display device are needed. Disclosure of Invention The embodiment of the invention provides a display panel and a display device, wherein a substrate is limited to point to a light-emitting functional layer, a first type refraction layer and a second type refraction layer are alternately laminated, the thicknesses of the first type refraction layer and the second type refraction layer are adjusted, and the reflectivity of a light extraction layer is adjusted, so that the gain of the formed light extraction layer for light emitting of a specific wave band is enhanced, the spectrum narrowing is realized, the color point range is enlarged, the color gamut is improved, the brightness attenuation specification is met, the display effect of the display panel is further improved, and the service performance of the display panel is improved. The embodiment of the invention provides a display panel, which comprises a substrate, a light emitting functional layer and a light extraction layer, wherein the light emitting functional layer is arranged on one side of the substrate and comprises a plurality of light emitting units, the light extraction layer is arranged on one side of the light emitting units, which is away from the substrate, along the direction perpendicular to the surface of the substrate, and comprises at least two layers of first type refractive layers and at least one layer of second type refractive layers, the substrate points to the direction of the light emitting functional layer, the first type refractive layers and the second type refractive layers are alternately laminated, the refractive index of each first type refractive layer is smaller than the refractive index of the second type refractive layer, or the refractive index of each first type refractive layer is larger than the refractive index of the second type refractive layer, and the thickness of at least one layer of the first type refractive layer and the thickness of at least one layer of the second type refractive layer are different. In a second aspect, an embodiment of the present invention provides a display device including the display panel in any one of the above embodiments. Compared with the related art, the display panel provided by the embodiment of the invention comprises the substrate, the luminous functional layer and the light extraction layer, wherein the light extraction layer comprises the first type refraction layer and the second type refraction layer with different refractive indexes, the first type refraction layer and the second type refraction layer are alternately laminated by limiting the direction from the substrate to the luminous functional layer, the thicknesses of the first type refraction layer and the second type refraction layer are adjusted, the reflectivity of the light extraction layer is adjusted, so that the gain of the formed light extraction layer for light emission of a specific wave band is enhanced, the spectrum narrowing is realized, the color point range is enlarged, the color gamut is improved, the brightness attenuation specification is met, the display effect of the display panel is improved, and the service performance of the display panel is improved. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art. Fig. 1 is a schematic structural view of a display panel according to an embodiment of the present invention; FIG. 2 is a partial schematic view of FIG. 1 at A provided in accordance with one embodiment of the present invention; FIG. 3 is a schematic cross-sectional view at B-B' of FIG. 2 provided by an embodiment of the pres